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Method of producing patterned birefringent product and birefringent pattern building material

a technology of birefringent and product, which is applied in the direction of instruments, polarising elements, photomechanical equipment, etc., can solve the problems of insufficient design properties, insufficient thermal resistance, and inability to align high-molecular cholesteric liquid crystals at the same tim

Inactive Publication Date: 2014-06-10
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem in which the high-molecular cholesteric liquid crystal takes time for alignment.
Further, thermal resistance is also problematic in the production of the forgery-preventing card, since the aligned cholesteric material is rapidly cooled to fix the alignment.
Further, the forgery-preventing card described in JP-A-63-51193 has no pattern and resultantly is not enough in terms of design properties and the like.
However, the patterning by etching is subjected to the restriction of a substrate.
The pattern-like heat treatment has a limited resolution of the pattern.
Further, the laser processing has a limited processing speed.

Method used

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  • Method of producing patterned birefringent product and birefringent pattern building material
  • Method of producing patterned birefringent product and birefringent pattern building material
  • Method of producing patterned birefringent product and birefringent pattern building material

Examples

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example 1

Production of Birefringent Pattern Building Material Showing Green Characteristic Reflection and Cholesteric Pattern Product

(Preparation of Coating Liquid for Dynamic Property Controlling Layer CU-1)

[0210]The composition below was prepared, filtered through a polypropylene filter having a pore size of 30 μm, and the filtrate was used as a coating liquid for forming a dynamic property controlling layer CU-1.

[0211]

Composition of Coating Liquid for Dynamic property controlling Layer(% by mass)Methyl methacrylate / 2-ethylhexyl acrylate / benzyl5.89methacrylate / methacrylic acid copolymer (copoly-merization ratio (molar ratio) = 55 / 30 / 10 / 5, mass-average molecular weight = 100,000, Tg: about 70° C.)Styrene / acrylic acid copolymer (copolymerization 13.74ratio (molar ratio) = 65 / 35, mass-averagemolecular weight = 10,000, Tg: about 100° C.)Dimethacrylate of Ethoxylated Bisphenol A9.20BPE-500 (trade name, manufactured by Shin-Nakamura Chemical Co., Ltd.)Fluorine series surfactant0.55Megafac F-780-...

example 2

Production of Birefringent Pattern Building Material Showing Blue Characteristic Reflection and Cholesteric Pattern Product

(Preparation of Coating Liquid for Optically Anisotropic Layer LC-2)

[0229]The composition below was prepared, filtered through a polypropylene filter having a pore size of 0.2 μm, and the filtrate was used as coating liquid for forming an optically anisotropic layer LC-2.

[0230]

Composition of Coating Liquid for Optically Anisotropic Layer(% by mass)Rod-like liquid crystal (LC-1-1)30.67Chiral Agent (Paliocolor LC756, trade name, 1.83manufactured by BASF Japan Ltd.)Horizontal aligning agent (LC-1-2)0.10Cationic photopolymerization initiator (CPI100-P, 0.67trade name, manufactured by San-Apro Ltd.)Polymerization control agent (IRGANOX 1076, trade name,0.07manufactured by Ciba Specialty Chemicals Corporation)Methyl ethyl ketone66.66

(Production of Cholesteric Pattern Building Material CPM-2)

[0231]Transferring material for producing cholesteric pattern, TR-2, was prepa...

example 3

Production of Birefringent Pattern Building Material Showing Red Characteristic Reflection and Cholesteric Pattern Product

(Preparation of Coating Liquid for Optically Anisotropic Layer LC-3)

[0233]The composition below was prepared, filtered through a polypropylene filter having a pore size of 0.2 μm, and the filtrate was used as coating liquid for forming an optically anisotropic layer LC-3.

[0234]

Composition of Coating Liquid for Optically AnisotropicLayer(% by mass)Rod-like liquid crystal (LC-1-1)31.13Chiral Agent (Paliocolor LC756, trade name, 1.37manufactured by BASF Japan Ltd.)Horizontal aligning agent (LC-1-2)0.10Cationic photopolymerization initiator (CPI100-P, 0.67trade name, manufactured by San-Apro Ltd.)Polymerization control agent (IRGANOX 1076, trade name,0.07manufactured by Ciba Specialty Chemicals Corporation)Methyl ethyl ketone66.66

(Production of Cholesteric Pattern Building Material CPM-3)

[0235]Transferring material for producing cholesteric pattern, TR-3, was prepare...

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PUM

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Abstract

A method of producing a patterned birefringent product, comprising at least steps [1] to [3] in this order:[1] producing a birefringent pattern building material comprising at least one optically anisotropic layer, which is formed by a process including:coating and drying a composition containing at least one rod-like liquid crystalline compound having at least two reactive groups and at least one chiral agent to form a cholesteric liquid crystal phase; and thensubjecting the cholesteric liquid crystal phase to heating or exposure to radiation to form the optically anisotropic layer containing a polymer fixed by polymerization and fixing;[2] subjecting the birefringent pattern building material to a patterned exposure to light; and,[3] baking a laminate obtained after the step [2] at 50° C. or higher and 400° C. or lower.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a method of producing a patterned birefringent product that can be used for a forgery-preventing means, an optical device, or the like. Further, the present invention relates to a birefringent pattern building material that can be used in the aforementioned method.BACKGROUND OF THE INVENTION[0002]A special image using an optical anisotropy is used as a medium to identify (discriminate) authenticity, for example, securities, credit cards, and documents. In the use of these media, further improvement in a forgery-preventing property or a design property is desired.[0003]As one of techniques which affect a visual state of the image or a state of the image itself, with the use of an optical anisotropy, there is a technique in which a cholesteric liquid crystal is used as an identification (discrimination) medium, and a reflected light of the cholesteric liquid crystal is detected by visual observation or an optical instrument....

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G02B1/10B32B9/00B42D25/30B42D25/328B42D25/364B42D25/40C08F2/50C08G65/18C08K3/00C08L21/00C08L83/04G02B5/30
CPCG02B5/3083G02B5/3016
Inventor KANEIWA, HIDEKIAMIMORI, ICHIRO
Owner FUJIFILM CORP